Spring take-up for filter units



.Oct. 10, 1939." J; s, IRVINE 2,175,195

SPRING TAKE-UP FOR FILTER UNITS Filed July 30, 1937 1 INVENTOR.

I ATTORNEYS.

Patented Oct. 10, 1939 t I V I r g, f

stars seams. TAKE-J11? son rnxraa lUNllTS Jan S. Irvine, Toledo, Ghio, assignor, by mcsne assignments, to wens-Corning Fiberglass Corporation, a corporation of Delaware Application .llnly 3%, 1937, Seriai No. 156,553 3 Claims. (Cl. 183-4?) My invention relates to air and gas filters, paring frame l l. Each filter unit comprises a body ticularly of the type in which the individual filter of loosely matted glass fibers or other base of units are removably mounted in a supporting suitable filter material,"Tlie filter unit includes frame. In filtering apparatus of this type, it is a frame it in which the mat of fibers is supported,

necessary or desirable to provide sealing means said frame comprising telescoping sections con- 5 by which leakage or by-passing or the air or gas sisting of chip-board, stifi paper, or other suitis prevented, Such sealing means ordinarily conable material for giving the required strength, sists of a gasket or the like interposed between stiffness and integrity to the filter unit. the filter unit and the frame or they walls of the The framework it in which the filter units are cell in which the unit is mounted. The filter unit mounted may be of conventional construction ill is commonly held in position within the frame comprising rectangular cells to receive the filter by a locking member or bar. Such locking memunits. Such a construction is shown, for example, ber holds or forces the filter back against a seatin the patent to Collins, No. 1,898,424, February ing flange on the frame, with the gasket inter- 21, 1933. The frame it as herein shown comlg posed between said frame and the back. of the pr ses horizontal frame members [3 forming the lid filter. top and bottom walls of the cells, correspondin In practice, it is often found difficult or impos- Vertical frame members being provided to form sible to maintain a substantially air-tight seal, the end walls of the cells. As shown in Fig. 3, even when a close fit is provided at the time the the rear marginal portion of each frame memm unit is installed. There is a tendency for the her it is bent downward in the form of a flange 2g filter unit to swell when subjected to dampness, it, the inner surface of which provides a vertior to dry out and shrink. With conventional a e. al sur a e forming an a t f the up paratus such as above indicated, there is no adeend of a filter unit. Strips-l5 which may be q ote meansprovided to accommodate this swellsecured to the frame members It provide similar ing or shrinking of the filter unit after it has abutments for the lower margins of the juxtag5 been secured in place in the supporting frame. p d filter s- As a result looseness develops, permitting unde- As herein shown, two filter units it are mountsirable air leakage. ed one behind the other Within each cell, al-

An object of my invention is to overcome this u h a greater 1655 number y be used f difficulty by the provision of suitable means, for desired. Interposed between the innermost filter 3o automatically taking up any looseness and in unit'and the frame members l4, I5 is a gasket 56 this manner maintaining an efiective seal, of felt or other soft yielding material suitable A more specific object of the invention is to r or i e between the filter n and provide spring means in combination with the the 1 l clamping device, for maintaining a continuous f The filter units a held in place Wi hin h 5 yielding pressure against the filt r it in a frame cells by means of a locking bar or memner to maintain an effective seal regardless of her 9 which is readily remOVable to facilitate 8 shrinking or swelling of said unit due to changes quick removal or replacement of the filter units. in temperature, moisture conditions, or other The locking bar 60111914885 3 Strip of hee m l wire causes. v or the like bent to form longitudinally extending Other objects of the invention will appear heremarginal portions flanges 2| having their Su inafter. faces in a vertical plane, and an intermediate Referring to the accompanying drawin horizontally disposed body portion 22 substantial- Fig. 1 is a perspective view of a clamping or y u-shfiped in 5 section- The locking bar 5 looking bar provided with spring means for hold- 29 has Sliding engagement with the a e e ing the filter units in position; ber' 13 which enters the longitudinal slot or Fig. 2 is a diagrammatic plan view of a filter groove 23 in the y A P 24 fi ed t0 the assemblage, showing means for holding the filter locking and extending through the 810i; units in a cell; V is arranged to engage an inclined slot 25 formed Fig. 3 is a sectional elevation of the same; and in t frame Piece 3 holding the locking bill 50 Figs. 4, 5, 6 and 7 are diagrammatic views n p showing various modified forms of the spring In order to maintain a yielding pressure of the holding means. filter units against the cell walls or the inter- Referring particularly to Figs. 2 and 3, filter posed sealing gasket, I provide spring means in 5 units or packages M are mounted in a supportterposed between the locking bar 20 and the filter units. Such spring means may comprise one or more-leaf springs 28 attached to the locking bar. Asshowninl'lg.l,eachoftheleafsprings 26 is attached, by means of rivets 21 or the like, on the inner or active face of a flange member 2|, that is, the face presented toward the filter unit. The springs II are bowed as shown, so as to contact at an intermediate point with the filter unit, one end of the spring being free for sliding movement alongthe locking bar 20 when the spring is placed under pressure.

It will be seen that with this construction, when the locking bar is in position (Fig. 2 the springs 2| continuously exert a yielding pressure against the filter units whereby said'units are caused. to bear at all times with a yielding pressure against the sealing gasket. In this manner, an effective seal is maintained regardless of swelling or shrinking of thefilter units due to moisture, heat, or other causes. This construction also permits a much greater tolerance in the filter units and frames without introducing looseness or per-.

mitting air leakage.

Fig. 4 illustrates a modification in which the leaf springs 26 are anchored at both ends as by means of rivets 21 and 21'.

Fig. 5 illustrates a further modification in armies Fig. 6 shows a further modification in which the spring assumes the formof a compound curve comprising a plurality of outwardly bowed portions 26" to contact with the filter unit.

Fig. 7 shows a further modification in which a plurality of bowed springs 28 are provided. said springs being positioned at different poin lengthwise of the locking member.

Modifications may be resorted to within the spirit and scope of my invention.

I claim:

l. A bar locking device adapted to hold a filter unit in a frame, said locking device having flange portions extending lengthwise thereof, and leaf springssecured to said flange portions in such amanner that the springs have long, fiat, bearing surfaces in contact with the filter unit when said locking-device is in its holding position.

2. A locking bar adapted to hold a filter-unit within a frame, and a leaf spring secured to said bar in such manner that the spring has a long, flat, bearing surface in contact with the filter unit when the locking bar is in its holding position'.

3. A locking bar adapted to h ld a filter unit in a. frame, leaf spring means secured to the locking bar ina manner to provide bearing surfaces arranged to contact with the filter unit at widely spaced points and hold said unit with a yielding pressure within said frame.

JAN S. IRVINE. 

